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authorJames Bowman <jamesb@excamera.com>2017-11-01 18:34:25 -0700
committerJames Bowman <jamesb@excamera.com>2017-11-01 18:36:51 -0700
commitdcc31d286ad05aa93577181f9a8292009622363e (patch)
treef455afb6e8e5f4ff9c702fa00d129091f94e9be5 /gdb
parent89f3c4b6b9b565720f88636d966f22923c03e9cb (diff)
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FT32: support for FT32B processor - part 2/2
FT32B is a new FT32 family member. This patch adds support for the compressed instructions to gdb and sim. gdb/ChangeLog: * ft32-tdep.c (ft32_fetch_instruction): New function. (ft32_analyze_prologue): Use ft32_fetch_instruction(). sim/ChangeLog: * ft32/interp.c (step_once): Add ft32 shortcode decoder.
Diffstat (limited to 'gdb')
-rw-r--r--gdb/ChangeLog5
-rw-r--r--gdb/ft32-tdep.c30
2 files changed, 29 insertions, 6 deletions
diff --git a/gdb/ChangeLog b/gdb/ChangeLog
index a1621e3..f3100f4 100644
--- a/gdb/ChangeLog
+++ b/gdb/ChangeLog
@@ -1,3 +1,8 @@
+2017-11-01 James Bowman <james.bowman@ftdichip.com>
+
+ * ft32-tdep.c (ft32_fetch_instruction): New function.
+ (ft32_analyze_prologue): Use ft32_fetch_instruction().
+
2017-10-31 Simon Marchi <simon.marchi@polymtl.ca>
* cli/cli-script.c (execute_control_command): Rename to ...
diff --git a/gdb/ft32-tdep.c b/gdb/ft32-tdep.c
index 757301a..85c5dd0 100644
--- a/gdb/ft32-tdep.c
+++ b/gdb/ft32-tdep.c
@@ -139,6 +139,25 @@ ft32_store_return_value (struct type *type, struct regcache *regcache,
}
}
+/* Fetch a single 32-bit instruction from address a. If memory contains
+ a compressed instruction pair, return the expanded instruction. */
+
+static ULONGEST
+ft32_fetch_instruction (CORE_ADDR a, int *isize,
+ enum bfd_endian byte_order)
+{
+ unsigned int sc[2];
+ ULONGEST inst;
+
+ CORE_ADDR a4 = a & ~3;
+ inst = read_code_unsigned_integer (a4, 4, byte_order);
+ *isize = ft32_decode_shortcode (a4, inst, sc) ? 2 : 4;
+ if (*isize == 2)
+ return sc[1 & (a >> 1)];
+ else
+ return inst;
+}
+
/* Decode the instructions within the given address range. Decide
when we must have reached the end of the function prologue. If a
frame_info pointer is provided, fill in its saved_regs etc.
@@ -153,6 +172,7 @@ ft32_analyze_prologue (CORE_ADDR start_addr, CORE_ADDR end_addr,
enum bfd_endian byte_order = gdbarch_byte_order (gdbarch);
CORE_ADDR next_addr;
ULONGEST inst;
+ int isize = 0;
int regnum, pushreg;
struct bound_minimal_symbol msymbol;
const int first_saved_reg = 13; /* The first saved register. */
@@ -186,16 +206,15 @@ ft32_analyze_prologue (CORE_ADDR start_addr, CORE_ADDR end_addr,
return end_addr;
cache->established = 0;
- for (next_addr = start_addr; next_addr < end_addr;)
+ for (next_addr = start_addr; next_addr < end_addr; next_addr += isize)
{
- inst = read_memory_unsigned_integer (next_addr, 4, byte_order);
+ inst = ft32_fetch_instruction (next_addr, &isize, byte_order);
if (FT32_IS_PUSH (inst))
{
pushreg = FT32_PUSH_REG (inst);
cache->framesize += 4;
cache->saved_regs[FT32_R0_REGNUM + pushreg] = cache->framesize;
- next_addr += 4;
}
else if (FT32_IS_CALL (inst))
{
@@ -210,7 +229,6 @@ ft32_analyze_prologue (CORE_ADDR start_addr, CORE_ADDR end_addr,
cache->saved_regs[FT32_R0_REGNUM + pushreg] =
cache->framesize;
}
- next_addr += 4;
}
}
break;
@@ -229,7 +247,7 @@ ft32_analyze_prologue (CORE_ADDR start_addr, CORE_ADDR end_addr,
/* It is a LINK? */
if (next_addr < end_addr)
{
- inst = read_memory_unsigned_integer (next_addr, 4, byte_order);
+ inst = ft32_fetch_instruction (next_addr, &isize, byte_order);
if (FT32_IS_LINK (inst))
{
cache->established = 1;
@@ -241,7 +259,7 @@ ft32_analyze_prologue (CORE_ADDR start_addr, CORE_ADDR end_addr,
cache->saved_regs[FT32_PC_REGNUM] = cache->framesize + 4;
cache->saved_regs[FT32_FP_REGNUM] = 0;
cache->framesize += FT32_LINK_SIZE (inst);
- next_addr += 4;
+ next_addr += isize;
}
}